Kombu-Dashi Miso Soup with Silken Tofu

By AislePrompt Test Kitchen · Reviewed by AislePrompt Editorial · ·

A minimalist Japanese soup where the umami depth of homemade dashi elevates simple tofu and vegetables into a soul-satisfying bowl. Authentic dashi requires no dashi stock—just kombu and katsuobushi. This japanese-inspired soups ready in about 25 minutes pairs kombu, water, katsuobushi for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 112 calories and feeds 2, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 15 min Cook: 10 min Serves 2 Japanese cuisine 112 cal/serving
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Ingredients

Instructions

  1. Step 1: Place 10g kombu in 1L cold water in a pot; bring to 60°C (140°F) over medium-low heat—never boil, as it makes kombu bitter—then remove kombu after 2 minutes.
  2. Step 2: Add 5g katsuobushi to the pot, bring to a gentle simmer (do not boil), and simmer for 2 minutes; strain through a fine-mesh sieve into a bowl, discarding solids.
  3. Step 3: Cut 200g silken tofu into 1.5cm cubes and add to the strained dashi; heat gently over medium-low until bubbles form around the edges (about 3 minutes).
  4. Step 4: Stir 3 tbsp miso paste into the soup until fully dissolved, then add 10g rehydrated wakame seaweed and chopped green onions; heat for 1 minute until fragrant but not boiling.

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Frequently asked questions

How long does Kombu-Dashi Miso Soup with Silken Tofu take to make?

Total time is about 25 minutes (15 min prep + 10 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Kombu-Dashi Miso Soup with Silken Tofu?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep kombu from drying out.

Can I substitute ingredients in Kombu-Dashi Miso Soup with Silken Tofu?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Kombu-Dashi Miso Soup with Silken Tofu for a different number of people?

The recipe is written for 2 servings. Multiply each ingredient by (your serving target / 2). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

What goes well with Kombu-Dashi Miso Soup with Silken Tofu?

Japanese soups like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.

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